Context of Lesson: This lesson is taking place following a lesson dealing with physical properties, changes, and exploring the different kinds of substances that exist. This lesson will be used to help students see the difference between the physical and chemical changes and students will be working in the lab again, using a tea candle and observing what changes happen to the candle from burning it. Students will be asked to relate this back to the CSI type lab, where knowing the difference between these kinds of changes could be useful.
Opportunities to Learn:
Depth of Knowledge: Levels One and Two
Prerequisite Knowledge: For this lab students must know several physical properties, they must have an idea of what chemical properties are as well, and students will begin to use these understandings to realize how chemical and physical changes in matter aide in identifying unknown substances.
Plans for Differentiating Instruction: I will be differentiating this lesson by providing written instructions and a pre-made data table for making the data collected easier to organize.
Accommodations and modifications: This lesson is being modified through presenting the students with the KWL chart, which will help students organize their thoughts and make the goals of the lesson more clear to students.
Environmental Factors: As always, safety is important and the lab areas must be clean of unnecessary materials, and the floors should be free of any obstructions. This lab should also be done in a well ventilated area.
Materials:
Teacher-
Candles (paraffin wax C20H42)
250mL Beaker
Candle holder
Matches
Goggles
Metric rulers
Balance (Triple Beam or Electronic)
Stopwatch
Objectives:
Students will distinguish between physical and chemical properties and changes.
Students will investigate the different kinds of changes in matter through the candle lab.
Add about 40 mL of water to the first beaker and the same amount of concentrated sulfuric acid to the second beaker.
Stir and let it stand.
Observe the difference between the two changes in the sugar.
Discussion Questions I could ask:
What is the difference between the processes in beaker I and beaker II?
"In which beaker do the reactants still have the same properties?"
How can we recognize or distinguish between a physical change and a chemical change?
In which of the two beakers could we get the sugar back as sugar?
What do you think happened in the second beaker?
What property do you think concentrated sulfuric acid has?
What do you think the black material in beaker two is?
Ultimately gear the conversation towards reactivity, the fact that something new was formed, and then state that today we will be delving into chemical properties and changes and we will return to this once the lab is completed.
Engagement
Powerpoint
Lecture Slides:
1.What are chemical properties?
2.What do these properties have to do with changes in matter?
Students will use a KWL to document the physical and chemical changes that take place when a candle burns. I will explain to students before the lab begins how to use the KWL, and also that they are to complete the K portion before beginning.
Do KWL together after the lab is completed.
Closing
At the end of this lesson I will ask students to tie it all together by asking them how understanding the differences in properties, changes, and different types of matter would be used in a CSI lab ( referring back to the question I had them answer last class.)
Use the remainder of the class to introduce the CSI lab students will be completing in the next couple of lessons.
We have our own crime to solve, and will be using what we have learned to this point about matter to solve it.
Assessment:
In this lesson students will be assessed informally on their lab skills, I will be monitoring lab safety. Students will also be formally assessed through the packet students will be completing during the candle lab. The KWL will be used to monitor student understanding, and the response questions and observations will be graded on completion and accuracy.
Chemical Changes
State Standards: GLEs/GSEs
PS1National Standards:
Context of Lesson: This lesson is taking place following a lesson dealing with physical properties, changes, and exploring the different kinds of substances that exist. This lesson will be used to help students see the difference between the physical and chemical changes and students will be working in the lab again, using a tea candle and observing what changes happen to the candle from burning it. Students will be asked to relate this back to the CSI type lab, where knowing the difference between these kinds of changes could be useful.Opportunities to Learn:
Materials:
Objectives:
Instruction:
- Opening: Demonstration:
- (video of the demo)
Procedure for DemonstrationAssessment:
In this lesson students will be assessed informally on their lab skills, I will be monitoring lab safety. Students will also be formally assessed through the packet students will be completing during the candle lab. The KWL will be used to monitor student understanding, and the response questions and observations will be graded on completion and accuracy.Reflections
(only done after lesson is enacted)Student Work Sample 1 – Approaching Proficiency:
Student Work Sample 2 – Proficient:
Student Work Sample 3 – Exceeds Proficiency: